Twilio · Rate Limits
Twilio Rate Limits
Twilio API rate limits enforce per-account concurrency on the REST API and carrier-imposed throughput limits on messaging products (e.g., A2P 10DLC TPS).
Twilio Rate Limits is the machine-readable rate-limit profile for Twilio on the APIs.io network, conforming to the API Commons Rate Limits specification.
It captures 5 rate-limit definitions, measuring concurrent, messages_per_second, and concurrent_calls.
The profile also includes 3 backoff/retry policies defined and response codes documented for throttled, concurrencyExceeded, and messagingThroughputExceeded.
Tagged areas include Rate Limiting and Communications.
5 Limits
Throttle: 429
Rate LimitingCommunications
Limits
REST API concurrent requests account
100
Default per-account concurrency; raise via support.
Messaging A2P 10DLC throughput (T-Mobile) campaign
75
Varies by brand vetting score and campaign trust score.
Messaging Toll-Free number
3
Verified Toll-Free Numbers can request higher TPS.
Messaging Short Code short_code
100
Default; can be increased via carrier vetting.
Voice concurrent calls account
1
Trial accounts; production accounts default to higher limits.
Policies
Carrier Filtering
Beyond Twilio rate limits, destination carriers enforce their own throttling and content filtering.
Queue and Retry
Twilio queues outbound messages exceeding TPS for up to 4 hours by default.
Geographic Permissions
Voice and SMS to specific countries must be enabled on the account before sending.
Sources
- https://www.twilio.com/en-us/sms/pricing/us
- https://www.twilio.com/en-us/voice/pricing/us
- https://www.twilio.com/docs/usage/api/rate-limits
Work with this as data
Every rate limit here is available over the APIs.io API and to AI agents over MCP.